Reheater



Oct. 3, 1933. J. TRAINER ET AL REHEATER Filed Sept. 6, 1930 2 Sheets-Sheet l w I W 7- 1, v v WE a 4 8 M a m M N m am E H a m 2 m 2 W 1 WW & A 2 m fl 3 4 a WM 8 8 MY \,Y ,I, 4 l v B y A 3 l ix t Oct. 3, 1933 J. E. TRAINER ET AL REHEATER Filed Sept. 6, 1930 2 Sheets-Sheet 2 R O T N E V N Patented 3, 1933 REHEATER. James E. Trainer and Ivar L. Langvand, Barberton, Ohio, 'assigncrs to The Babcock & Wilcox Company, Bayonne, N.'.J., a corporation of New Jersey,

' Application September 6,1930. Serial No. 480,148

This inventionrelates to rehe'aters and-more particularly to a reheater for steam'in which the heating medium is steamat a high temperature.

. An object of the invention is to provide a heater which steam';at a relatively low pressure-is heated by steam at a higherpressure.

Other objects of the invention'will be apparent to those skilled in this particular art from the the drawings, in which Fig. 1 is a side view partly in section'of an embodiment of the invention;

Fig. 2 a plan View in section 2 +2 of Fig. 1; V r Fig; 3'is a view in section along the line 3-3 of Fig.1;

description in the specification in connection with along the line Fig. 4 is an enlarged plan view in section taken along the line 44 of Fig. 1;

Fig. 5 is a side view of a detail of the invention; Fig. 6 is a section taken on line 66 of both Fig. '7 is a; plan view of a detail of the invention; Fig. 8 is a sectional viewo'fa detail of the in- ..ventiontaken along the line 8-8 of Fig. 6.

as T

'One embodiment of the invention is shown for purpose'sof illustration in which in Fig. 1 a casing l has an upper section 2 riveted thereto. A-

flange 3 is secured to the upper part of the casing -2. by'any well known means, such as byriveting.

A head has a similar flange 5 secured thereto and is secured to the upper part of the casing 2 by bolt s6 extending through the flanges 3 and 5. A low pressure steam inlet '7" is located in the lower part of the casingi' and a low pressure These headers 14 are smallbox headers and are disposed at an angle to the headers 12 as shown in Figs. 3 and 4. A plurality of tubes 15 having ends of jreduced'diameter are expanded in the headers 14 and madejsteamtight by welding. These tubes 15 extend downward'through the casing 1 and are expanded and welded in a lower groupof secondary headers 16. These headers 16 are connected through steam pipes 1'7 to lower headers 18 similar in character and arrangement to' the headers 12. The headers 14 are so" arranged that adjacent headers are in different c'iired to the sides of the casing lbetweeri the The low pressure steam to be reheated will first" 11 Claims. (crest-227) planes, alternate headers being in the sarne plane and the lower secondary headers were similarly arranged-x By virtue of this arrangement as" shown most clearly in Figs. 5 and 6, a space is'left betweenadjacent secondary headers to permit 150 the free passage of a fluid and close spacing of the tubes'15. y H Condensate'pipes 20 are secured to the lower? headers 18 and extend downward through stufling boxes 21 mounted in the lower part of the bottom head 22. The head 22 is secured-to the casing 1 in 'steamtight- "relation therewith H in any war known manneryas by riveting. Baffies 25 are'sesecondary headers '14 and the lower' secondary headers 16 and are so located as to compel-any: fluid passing throughfthe' casing to passinclose-j: contact with the' tubes 15' by preventing any by-- passing of the fluid outside the rows' of tubes I In the operation of the device'high pressure steam is admitted to the'headers I-Zthrough'the inlet pipes 11 and flows by means of the con necting pipes 13, secondary headers land tubes 15 to the lower secondary headers 16. and from" there through the connecting pipes .17 to. the lower. headers 18. T r P The steam ,at relatively low pressure' to be reheated comes into the "casing through the inlet "7." This steam may be exhaust steam from ahigh pressure stage of a'turbine' The several baffling arrangements 25' direct this steam across i i thetubes 15- counter'flow to the high pressure steam flowing withinthe tubesf k The high pressure steam admitted to the up- 1 per-headers 12 may besuperheatedfsteam, and 90 in the'lower part of the tubes '17 during-the normal operation of the device this high pressure; steam'will have lostits superheat and a certain amount of condensation will have taken place:

come in contact with the hot water that is 'formed from the condensation ofthe highpressuresteam, and-a certain amount of the sensible heat of this water will be imparted to this 10w, 7 pressure steam and its temperature will be raised. In the condensation resulting within the tubes 15- a much larger amount of heat may be trans-- ferred to the low pressure stearn as the latent heat or" the high pressure steam is here avail-,-, I able. In the upper portion of the tubes15 when high pressure superheated steam is used a further rise in temperaturewill be imparted to the low pressure steam by virtue of V the superheat' contained in the high pressure steam. 1 r In the embodiment of the invention here de- 11d:

scribed the high pressure steam system is one having a dead end and the amount of flow of the high pressure steam in this system is measured by the amount of condensation of the steam in heating the .low pressure steam with the subsequent removal of the water of condensation.

Although high pressure steam has been described as the heating. medium andlow pressure steam has been specifically designated as themedium to'be heated, other mediums such as mercury vapor will function in the disclosed ap-' paratus and their use is contemplated to be within the scope of this invention- What we claim as new and desireto secure by Letters Patent is I r 1. In a heater, a casing, arow of headers lo--' cated within said casing, a second row of headers spaced apart from said first named headers, connectingpipes having one end of each connected to said headers, secondary headers connected'to" planes, a plurality of tubes connecting certain of said secondary headers in pairs. I

I 3. In a heater, a casing, a row of headers lo:- cated within said casing, a SBCOIld'IOW of headers spaced apart from said first named headers, con necting pipes having one end of each connected to said headers, secondary headers connected to said connecting pipes at the other end thereof, a

49 plurality of tubesconnected to said secondary headers, said tubes being of reduced diameter at the point where they are connected. with the secondary headers, said tubes connecting certain of said secondary headers in pairs. 3 .4. In a heat transfer device, a pressure retaining casing, primary fluid distributing headers disposed within said casing, secondary fluiddistributingheadersconnected tosaid primary headers located within said casing, and a plurality of 9ztubes connectingsaid secondary headers in pairs sopositioned with respect to .each other that equispaced gas paths are provided betweentubes.

5. In a heat transfer device, a pressure retaining casing, primary fluid distributing headers disposed within said casing, a plurality of secondary fluid distributing headers connected to said .primary'headers and disposed at an angle thereto located within said casing, and a plurality of tubes connecting said secondary headers and 1 so positioned with respect to each other thatequispacedgas paths are provided between tubes. .6..Apparatus for effecting heat transfer between fluids at different temperatures comprising a casing, means providing a closed flow path ing inlet 'and outlet rows of primary headers spaced axially of said casing, inlet and outlet groups of secondary headers spaced axially of 70 said casing between said rows of primary head- 'ers, tubes connecting certain secondary headers in each group to corresponding primary headers, and a tube bank formed by a plurality of tubes connecting corresponding secondary headers of said groups, and inlet and outlet connections to for one of the fluids through said casing includrow to a corresponding primary header, the sec-- said casing for the passage of the second fluid therethrough in contact with the tubes in said tube bank.

v'7. Apparatus for effecting heat transfer between fluids at difierent temperatures comprising a casing, means providing a closed flow path for one of the fluids through said casing including inlet and outlet rows of primary headersspaced axially of said casing, inlet and outlet groups of corresponding primary header, and a tube bank formed by a plurality, of tubes connecting corresponding secondary headers of said groups, and inlet and outlet connections to said casing for the passage of the second fluid therethrough in contact with the tubes in said tube bank.

8. Apparatus for I effecting" heat transfer between fluids at differentitemperatures-compris. ing a casing, means providing a'closed flow pathf for one of the fluids through said casing including inlet and. outlet rows of [primary headers spaced axially of said casing yinlet and outlet groups of secondar'yheader s spaced axially of said casing between said rows of primary headers, said secondaryheaders being arranged in rows extending longitudinally of said primary headers, tubes connecting thelsecondary headers in each row to a corresponding primary header, the secondary'headers in each row being staggered suf ficiently to provide flow passages therebetween, and a tube bank formed. by a plurality of closely spaced tubes connecting corresponding secondary headers of said groups, and inlet and outlet con necticns to said casing for: thepassage of the second fluid therethrough in contact with the tubes in said tube bank. 1 7

9. Apparatus for effecting heat' transfer be-- tween fluids at different temperaturescomprising" a casing means providing a closed fiOWTDath for one ofthe fluids through said casing including in-.

let and outlet rows of primary headers spaced 12Q axially of said casing, inlet and outlet groups of secondary headersspaced axially ofs'aidcasing between said rows of primary headers, said secondary headersbeing arranged with th'eirf axes oblique to thej jaxes'of saidprimaryjheaders and in rows extending. longitudinally of said primary h aders, tubes connecting the secondary headers. in each row to a-corresponding"priinary header, the secondary headers in each row being staggered sufiiciently to provide flow passages there-113C! between, and a tube bank formed by a'plur'ality of closely spaced tubes connecting, corresponding secondary headers of said groups,- and inlet,.and outlet connections to said casing for the. passage of the second fluid therethrough in contaetwith'mfi the tubes in said tubebankL, l

'10. Apparatus for eifecting heattransfer be-j tween fluids-at different temperatures comprise} ing a casing, meansproviding'a closedI flow path for one of the fluids through said casing includ; ing inlet and outlet'rows of primary [headersspaced axially of said casing, inlet and outlet groups of secondary headers spaced axially or said casing between said rows of primary headers, said" secondary headers being arrangedin rows extending longitudinally. of. said primary'headers, tubes-connecting the secondary headers in each ondary headers in each row' being staggered'sufficiently toprovide flow passages therebetweemlfio and a tube bank formed by a plurality of closely spaced swaged ended tubes connecting corresponding secondary headers of said groups, and inlet and outlet connections to said casing for the passage of the second fluid therethrough in contact with the tubes in said tube bank.

11. Apparatus for effecting heat transfer between a high temperature high pressure fluid and a low temperature low pressure fluid comprising a casing, means providing a closed flow path for the high temperature fluid through said casing including inlet and outlet rows of horizontally spaced primary headersspaced axially of said casing, inlet and outlet groups of secondary headers spaced axially of saidcasing between said rows of primary headers, said secondary headers being arranged with their axes at an angle to headers for the passage of the low temperaturefluid through said casing in contactwith the tubes in said tube bank. V JAMES E. TRAINER.

IVAR L. LANGVAND. 

